I fall on Earth’s surface as rain, snow, sleet, or hail. What am I?

I am the changing of a liquid into a gas. What am I?

I am a mixture of decayed plant and animal material that can be used as fertilizer. What am I?

I am the continuous changing of nitrogen gas into compounds in the soil and its later release back to the air. What am I?

I am water that sinks beneath the ground and collects in tiny holes in soil and rock. What am I?

I am the continuous exchange of carbon among living things. What am I?

I am precipitation that flows over the land’s surface into rivers and lakes and is not absorbed into the ground. What am I?

I am the changing of a gas into a liquid as the gas cools. What am I?

Plants use nitrogen in the form of __________________.

Organisms called ___________________ release carbon dioxide when they break down dead organisms.

Water condenses in the atmosphere and falls, as _____________ into oceans and the ground, or over land as ____________.

Nitrogen ____________________ places nitrogen in a form in which it can be used by most living organisms.

Carbon dioxide is released back into the _________________ when living things use it as food.

Heat causes water to rise from Earth’s surface as a gas through a process called _______________________.

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